Cabpentek s clamp



UNITED STATES PATENT OFFICE.

BENJ. H. GREEN, vOE PRINCETON, NEW JERSEY.

CARPENTER S CLAMP.

Specification of Letters Patent No. 9,917, dated August 9, 1853.

To all w/Lom t may concern.'

Be it known that I,BENJAM1N H. GREEN, of Princeton, in the county ofMercer and State of New Jersey, have invented a new and ImprovedCarpenter-s Clamp; and I do hereby declare that the following is a fulland exact description thereof, reference being had to the accompanyingdraw ings, making part of this specification, in which- Figure l is aplan of my improved carpenters clamp, Fig. 2 a side elevation of thesame, and Fig. 3 side elevation of a part broken olf, showing a part ina different position.

Like parts are designated by like letters in all the figures.

I construct a frame, consisting` of an oblong beam A, of firm wood, andtwo upright supports E, E, of iron, which are furnished with projectionsreaching down the sides of said beam, near one end, and are coniinedthere by adjusting screws 2'., i &c. Said supports are connectedtogether by rods a, cz &c., the two lower ones being parallel with eachother. A screw B, is inserted, with stationary bearings, in the supportsE, E, in such a position that its axis shall be parallel with theguide-rods a, a. A driving nut F, works o-ver the screw B, and has alsoapertures, which travel on the guide-rods a, a. Another pair ofguiderods b, Z) pass through one of the supports, parallel with the rodsa, a, and with each other, and connect the driving nut F, with a movablejaw F. Said jaw travels fo-rward and backward when the screw B, .isturned one or the other way by the crank C. The liXed jaw Gr, isinserted in a suitable aperture near the other end of the beam A. Thisarrangement answers for large articles within certain limits. But toadapt my improved clamp to articles more .various in size, andespecially to small articles, I add the following device A pair of armsH, H, are attached, one on each side to the beam A, by means of a boltg, passing through one end of each arm and horizontally through the saidbeam. Said arms vibrate upon the bolt g, which may be transferred toother holes in the beam A,-as at f,-in order to change the position ofthe arms if desired. The movable ends of said arms curve up so as toreach above the beam A, when they are in a horizontal position. Anotherbolt L, passes through the curved ends of the arms, and through a bar I,which has a large jaw d, o-n its shorter, and a small jaw e, on itslonger arm. Said bar is made to turn freely upon the bolt It. A bar 0,having a small jaw corresponding with the small jaw-e, on one end, maybe attached to the large jaw F, but removable at pleasure. When said baris attached to the jaw,F, the small jaw c, of the bar I, is broughtopposite its jaw, as shown in Figs. l and 2. This arrangement. is usedfor clamping small articles. Then larger articles are to be clamped, thesmall bar c, 1s removed, and the bar I, reversed as shown in Fig. 3,which may readily be done when the arms H, H, are turned up over theirfulcrum g. By this means the jaw d, is brought opposite to the jaw F;which arrangement serves to clamp larger articles than the lastdescribed, but smaller than with the simple clamp.

My improved clamp is therefore by the several variations in the positionof its parts, as above described, rendered far more useful than theordinary clamp, because it is applicable to so many diiferent sizes ofarticles, while its simplicity and cheapness recommend it before otherinferior clamps.

The combination of the screw and double sets of guides, all parallelwith one another, render the operation of the clamp as perfect aspossible, by obviating friction and all lateral strain or warping of theparts.

IVhat I claim as my invention and desire to secure by Letters Patent,is-

The combination of the adjustable vibratory arms H, H, and reversiblejaws d, e, with the adjustable clamp, for the purpose of presenting jawsof'diiterent sizes and at different distances from each other,substantially in the manner herein set forth.

The above specification of my improved carpenters clamp signed this 18thday of .Tune 1851.

BENJAMIN H. GREEN. Witnesses Z. C. ROBBINs, J. S. BROWN.

